Work chuck



May 13, 1 T. ZIMMERMAN WORK CHUCK 2 SHEETS-SHEET 1 Original Filed Jan. 17, 1945 INVENTOR. THOMAS ZIMMERMAN ATTORNEYS May 13, 1952 T. ZIMMERMAN 2,596,321

WORK CHUCK Original Filed Jan. 17, 1945 2 sHEETs--s1-rEET 2 INVENTOR.

THOMAS ZI MMERMAN ATTORNEYS Patented May 13, 1952 WORK CHUCK Thomas Zimmerman, Dearborn, Mich., assignor to Kelsey-Hayes Wheel Company, Detroit, Mich., a corporation of Delaware Original application January 17, 1945, Serial No. 573,211. Divided and this application May 10, 1948, Serial No. 26,079

2 Claims. (Cl. 51-227) The invention relates to work chucks and refers more particularly to chucks for holding tubular work.

The invention has for one object to provide an improved chuck which is constructed to hold tubular work accurately in position and in accurate cylindrical condition.

The invention has for another object to provide a chuck comprising two units which are yieldably supported with respect to each other, one unit being engageable with the work to center the same and the other unit being engageable with the Work to longitudinally position the same.

These and other objects of the invention reside in the novel features of construction andcombinations and arrangements of parts as more fully hereinafter set forth.

In the drawings:

Figure 1 is a top plan view of a work chuck embodying the invention;

Figure 2 is a cross section on the line 2--2 of Figure 1;

Figure 3 is a side elevation of a portion of Figure 1.

The work chuck embodying the invention may be used to hold tubular work of various cross sections while various types of operations are being performed on the work. More particularly, the work chuck is designed to hold cylindrical work, such as a cylinder sleeve, a bushing, or a bearing, while the internal surface of the cylindrical work is being operated upon. Specifically, the cylindrical work is a relatively thinwalled cylinder sleeve provided at one end with an external annular flange.

The work chuck, as illustrated, comprises the base I, the uprights 2 on the base, the carrier 3 located between and mounted on th uprights, and the clamping units 4 and 5 on the carrier. The unit 4 externally engages the sleeve to accurately center the same and the unit 5 engages the opposite sides of the annular flange of the sleeve to longitudinally position the sleeve.

. The carrier 3 comprises the annular member 6 and the annular plates 1 and 8 secured to opposite ends of the annular member and extending radially inwardly therefrom. Suitable means, such as the bolts 9 and I0, secure the an nular plates to the annular member. The annular member 6 is journaled on the uprights by means of the gudgeons H which are fixedly secured to the annular member 6 by suitable means, such as the bolts I2. The carrier also comprises the coil springs I3 which extend between the annular plate 7 and the clamping unit 4 and yieldably support the latter on the former. I 4 are bolts extending through the annular plate I and encircled by the coil springs and threaded into the clamping unit 4 for limiting the movement of the clamping unit away from the annular plate. The carrier may be swung relative to the uprights through an angle of and may be locked in either position by means of the plunger l5 which extends through one of the uprights and into one of the holes l6 formed in the annular member 6.

The unit 4 comprises the annular member [1, the diaphragms H! on the annular member, the annular series of clamping jaws 19 on the diaphragms, and actuating means between the diaphragms for flexing the same to move the jaws. The diaphragms it are spaced longitudinally of the annular member I1 and comprise the resilient disc portions 20 which extend generally radially inwardly from the annular member and the axially extending arm portions 2| which extend away from each other and have secured thereto the jaws [9 which face generally radially inwardly. The disc portions 20 are secured to the annular member by means of the annular members 22 and 23 which are secured to the annular member [5 by suitable means, such as the bolts 24. The lower annular member 22 is threadably engaged by the bolts [4.

The means for flexing the diaphragms l8 to move the jaws 19 generally radially outwardly to released position comprises the aligned externally threaded actuating members 25 which have rounded ends engaging the disc portions 20 of the diaphragms at their radially inner ends. The actuating members are held from rotation relative to the diaphragms by the annular closure member 26 extending between the diaphragms at their radially inner ends and the key 21 between the closure member and the actuating members and extending into the diaphragms. 28 are internally threaded members threadedly engaging the actuating members 25 and formed with the rack teeth 29 which are opposed to each other. These rack teeth are engageable: by the teeth of the revoluble pinion 30 which is journaled in the base of the U-shaped annular member 3|. The member 3| is formed of two L-shaped rings fixedly secured together by the bolts 32 extending within the axially aligned flanges 33 of the rings which form the base. The member is located between the diaphragms and its base lies against the annular member IT. The radial flanges 34 of the L-shaped rings encircle the threaded portions of the internally threaded members 28 and also overlie the portions of the internally threaded members 28 having the rack teeth to thereby guide the internally threaded members, both radially and axially. 35 is an annular .spacerbetween th .internallythreaded members radially inwardly of the: pinion 36.

36 is a wrench insertable through an opening in the annular member 6 into a suitable polygonal socket in the pinion 36 to revolve the latter.

The construction is such that by revolving the pinion 30 in the proper direction 'theinternally' threaded members 28 will be rotated in opposite directions to move the externally threaded actuating members 25 axially of thecylindersleeve and away from each other to" thereby 'fiex'the disc portions 26 of the diaphragm and move the clamping jaws l9 on the diaphragms generally radially outwardly to released position. n the :other; hand, by turningthe pinion so in. the oppotsite. direction the diaphr-agrns will'be released and theinarmsandithe.jawswill be free to move generallyflrad-ially .inwardly under the inherent resiliencyin the discportionsof the diaphragms.

Thejawsexert a predetermined pressure on' the cylinder sleeve-sufiicient tolfirmly' grip and hold .thesleeve from'rotation while its internal surface the relatively thin wa l of the sleeveto thereby compel the. sleeve .to be truly cylindrical.

I The clamping unit'5 is mounted on the annular jplatet and ccmpriseslthe diametrically Opposite pairsof jawsitl and theicooperating diametrically .opposite'jaw.membersfifi. The jaws 31 are equally .spacedfromeach.other and are mounted on the .ex'tensionsiiifl of the annular. plate 8, the arms 2 I being cut away to receive the-extensions 39;and

. laws .3lwhi'ch,lit will be noted, clear the external -surfaceof'thecylinder sleeve. The 'jaws 3Tare,

however, formed with rabbets to receive'theex tern'aliannular' flange of" the sleeve which'has one side wall resting on'the jaws .31. The jaw. memfhers'f38 arebifurcated and'have at the ends .of

"their lfurcations'the jaws 40 whichare located axiallyoppositethe jaws 3'! and e'n'gagethe side ofthe external ann'ular'flan'ge ofthe sleeve oppositethe side engaged by the jaws? 31. suit, the jaws 3i and 46 cooperate to'effectively "longitudinally pcsition'the' sleeve. It'will also be noted that the jawsiilare positioned so'that their rabbets are engageable" with the external surface of the annular "fian'ge'ofthe"sleeve to approximately center-the same. The jaw members 38 are provided at theendsremote from the'furca- 'tions with "the'transverse projections M which are adapted to fulcrum upon the bottoms of the grooves 42 iormed'inthe annularplateii. 43 is ascrew threaded into the annularplate B and having ahead Mabutting a jawmember 38 intermediate its ends for moving the "same to "clamping position. 45 is a coil spring encircling eachof thescrews '43 and located in a recess in the "annular plate 8"and abutting the side of the "'adjacent'j'awmember38 to resiliently move the Same to"'released'position when the'associated screwis rotated to released position.

Wis-being operated .upon. Furthermore, theiaws exertthesamepressure .on the sleeve whichis sufficient to .overcome'the. resistance offered by From the above description it will be seen that I have provided a simple construction of work chuck having spaced diaphragms with clamping jaws thereon and provided with means between the diaphragms for moving the same to released position. It will also be seen that I have provided a simple construction of work chuck? having two clamping units, one of which is adapted to center the work and the other of which is adapted to longitudinally position the work. Further, it will :be seen that the clamping units are mounted on a carrier so that one unit is yieldably mounted withrespect to the'other.

lThisapplication is a division of my copending application, Serial No. 573,211, filed January 17.

1.19%?) nowPatentiNoi.2,521,275.

W hat I claim-as my invention is: 1;"A' chuck' for an externally flanged sleeve comprising an annular member, annular plates secured to opposite ends of said annular member,v a unit within said annulanmember for radially positioning Lthe'sleeve having jawsmovable radially inwardly of said annul'anmemberandf externally .engageable with the sleeve in-"a zone spacedifrom the'external flange of thesleeve, means for longitudinally jpositioning 'thesleeve having jaws mountedxon'one of said annular plates and movable axiallyof said annular'member and'engageable with one side'ofthe external fiangeioi the sleeve; and spring'means extending substantially parallel to the'aXis'of saidannular 'of'said annular member and engageable with one side of the external'fiange of the flangedmemher and: spring means abutting the other of said annular plates and said unit and 'yieldably supporting said unit for movement"axiallyof'isaid annular member.

'VIHOMAS ZIMMERMAN.

REFERENCES CITED Thelfollowing references .are of. record'in .the file of this patent:

' UNITED STATES PATENTS Number Name Date 424,698 Bailey Apr.1,-1890 1,800,540 Kempton Apr.31'4, I931 1,939,205 Connor Dec. 12,1933 1,952,130 Harrison Mari-27,1934 2,224,652 Kingsbury "Dec. 10;1940 7 2,269,946 Lange Jan. 13, 1942 2,328,650 Johnson "Sept. '7, 1943 2,361,142 Zimmerman 'Oct. 24, 1944 2,382,311 'I-Iealcl Aug. 14,1945

'Ljunggren June '14, 1'949 

